Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f39d80c4aa37be9…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 06:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cc8f14b472a36a4bce68e75c38bcff14 SHA-1: 29e0ad699a0ad61854d257e79cfeb4d11a2164ca SHA-256: 9f39d80c4aa37be9f832ad2f72abd815ff3947c16bdb8aed1cedb60492963f8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=intrusive+thoughts+meaning PDF link annotation
    • http://chiengthai.com/file_media/file_image/file/40727498506.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/18236592627.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/01d23951c93addf759200344c3ec0fe9/bagezebepozesuja.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/15781062228.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/devowulokipix.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/sogizemirikizaguraroba.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/70744979249.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/28601012208.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/visujewure.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8cac986ae---texufuvupodepo.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/4774a47cd17c1aae2e5a0b5cf23ac95b/50187315959.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/44142965922.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/9a4de0bcad753cbe9a5058fb596866fe/piwuv.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f0ba0e01e---basenudunekud.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ebeb1fce0---furasaranapudu.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4a28654a---xugakapaduvolininerate.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210829144708.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092825b199eb---funipuzuzosugagut.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/tezoxixadivajil.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/42137094295.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/1797754454.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/rikisikukelusim.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/22643702415.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/75091431982.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 18116 bytes
SHA-256: 2f66559ac053b15647548c224376202ad5ec98f995b7fc3174573ad40a268d57
font_02_sfnt_off00012c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C00 10628 bytes
SHA-256: f8e13c307ab260ad5b7d2e19638b84950e59271bca5b51d4c86fe268f19ea922

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